Collapsible tap.



W. H. GATES.

COLLAPSIBLE HP. Arrucmon mm an. 10. ms.

Patented Doc. 19, 1916.

2 SMETS-SMH 2.

INVEN TOR A ATTORNEY WI TIIESSfS:

v-| m1 nunIrmn-mu mum-nu I r WILLIAM H. GATES, OF NEW HAVEN,CONNECTICUT.

COLLAPSIIBLE TAP.

Sp..c1flcation of Letters Patent.

Patented Dec. 19, 1916.

Application filed September 10,-1915. Serial N 0. 49,896.

To all whom it may concern:

Be it known that I, WILmAu H. Ga'rns, a citizen of the United States,residing at New Haven, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements inCollapsible Taps: and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to makes and use thesame.

My invention relates to collapsible taps and it consists in certaindetails of construction to be more fully set forth in the followin"specification.

\eferring to the drawings.

Figure 1 re resents a broken view )artly in section of the head, itsshank, and s iding shell on line 1, 1 of Fig. 3, showing the threadin rdies in operative position; I ig. 2 is a broken view artly in section ofthe head, its shank, an sliding shell on line 2, 2 of Fig. 3, showin thethreading dies in operative position; I ig. 3 is a front elevation ofthe tool with the front late removed; Fig. 4 is a broken sectional viewof the sliding shell on line 4 of Fig. 2, showing the tri levermechanism in its normal closed posltion; Fig. 5 is a view similar toFig. 4, but showin the position of the tri lever when the slit mg shellis released; Fig. 6 is a detail view of one of the threading dies Fig. 7is a detail view of one of the cam olts; Fig. 8 is a detail view of oneof the studs for actuating the cam bolts; Fig. 9 is a broken view part]in section of the tool showing the threading dies colla sod; Fig. 10 isa section on line 10, 10 of Fig. 9; Figs. 11, 12, 13 and 14 are detailviews of the sliding shell locking mechanism.

The body of the tap comprises the end 1 carryin the threading dies 2, 3,4 and 5 the enlarge portion 6 and the shank 7, which latter is adaptedto enter a rotatable turret headnot shown. The dies are mounted to havea radial movement in the slots 8 formed in the forward end 1 of the tapbod and they are held in workable position herein by the plate 9, whichplate 1s held in place by suitable screws, one of which, 10, is shown inFig. 2. In Fi 3 are shown the threaded holes 11 for sai screws.

The threading bits or dies are actuated to open and close throuh themedium of the bolts 12, which bolts iave a longitudinally reciprocatingmovement in the holes 18 formed in the body of the tap. On the forwardends of these bolts are formed the cams 14, Fig. 7. Cam grooves-one ofwhich, 15, is clearly shown in Fig. 6are formed in the cutting face ofeach die to receive the cam projections of said bolts. The cam bolts areactuated through the medium of the studs 16 anchored in the slidingshell 17 and are additionally secured therein by the pins 18 shown inFigs. 1 and8. The forward end of each of these studs 16 is provided withthe hook portion 19. Fig. 8, adapted to engage the notch 20 in the rearend of each cam holt as shown in Figs. 1, 9 and 7. In order to employthe same method of actuating dies for internal threading to open andclose through the medium of longitudinally operating cam members carriedby a sliding shell, as applied to dies for external threading, it wasfound necessary to employ additional members like, for instance, thestuds 16 to actuate the cam members or bolts 12, as said bolts, in orderto actuate the dies, must necessarily be located so far within the bodyof the tap as to render it im ossible to connect them directly to theslicing shell. The shell 17 is slidablv mounted on the shank 7, and itsforward end is recessed to also embrace the enlarged portion 6 of thebody of the tap. The mechanism for automatically locking the shell inits advanced position and releasing the same is the same as shown in theintent granted to me on August 3, 1915, 0. 1,148,510. A briefdescrlption of this mechanism Will be necessary to show its connectionwith the present construction. The locking member 21, Fig. 14, isoperativol located in the recess 22, Fig. 2, of the tap ody and isoutwardly actuated by the spring 23. 24-see also Figs. 12 and 13-is adisk rotatably inserted in the shell 17 and maintained therein by theindicator dial 25-shown also in Fig. 11. The under side of the disk 24is provided with the cam recess 26 adapted to receive the upper end 27,Fig. 14, of the locking member.

The cam pin 28, Figs. 2, 4 and 5, is journaled in the rear wall of theshell 17 and is embraced by the trip lever 29 and is socured thereto bythe in 30. This lever is located and adapte to operate in the recess 31of the sliding shell. The reduced portion 32 of the cam pin 28 entersthe recase 38 of the locking member 21 so that, when the tool hasadvanced the proper distance, a trip-mot shown-will enga e theprojecting end of the trip lever 29 am turn the same into the positionshown in Fig. 5. This movement of the trip lever will depress thelocking member 21 and carry it out of the cam recess 26 and thus releasethe sliding shell 17, which is then forced rearward by the s rings 34.This return movement of the S1011 carries with it the studs 16 andsliding cam bolts 12, and the return of the cam bolts will draw thethreading dies inward and thus release the cutting operation. The turretwill then withdraw the tap body from the work. Immediately after therelease of the shell, the flat spring will return the trip lever 29 toits normal position shown in Fig. 4. To disengage the dies from the cambolts and remove them from the tap after the front plate 9 is removed,the cut away or relief 36, Fig. 6, is made to enable the dies to drawall? freelyin the direction of arrow a, Fi 9-from the cam projection 14of the bot 12. As the o erative travel of this cam projection is on yfrom a to b, Fig. 6, 1t is quite evident that the dies could not beremoved or entered were the cam slot of uniform width. The inner end ofthe stop pin 37, Fig. 2, carried by the shell 17, travels in the groove38, formed in the shank 7, to limit the outward travel of the shell.

live cents each,

Having thus described my invention, what I claim is:

1. A tap bod threading dies romovably located therein lia faces, slidingbolts havim cams to register with the cam grooves of the dies, a slidingshell embracing the tap body, means for locking the same thereto andunlocking it therefrom, and members carried by the shell to engage withsaid bolts and actuate tlhe same to open and close the threading les.

2. A tap body, threading dies removably located therein having camgrooves in their faces, longitudinally operating cam members adapted toregister with the cam grooves of the dies, said tap body having anenlarged portion and a shank portion, a sliding shell embracing saidshank and enlarged part of the tap body means for locking the same tosaid enlarged portion of the tap body and unlocking it t erefrom, andmembers carried by the shell to engage with said cam member to actuatethem to open and close a the threading dies.

In testimony whereof I aiiix my signature in presence of two witnesses.

WILLIAM H. GATES. Witnesses:

JOHN G. Evans, Tnno. E. HOPPEN.

by addressing the Commissioner of Patents,

Washington, D. 0."

ving cam grooves in than

